xref: /llvm-project/llvm/test/Transforms/InstCombine/shift-flags.ll (revision 2dd52b4527667837cc525aa48435ab5cbfa30a0b)

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=instcombine -S | FileCheck %s

define i8 @shl_add_nuw(i8 %amt_in, i8 %cnt_in) {
; CHECK-LABEL: @shl_add_nuw(
; CHECK-NEXT:    [[AMT:%.*]] = and i8 [[AMT_IN:%.*]], 63
; CHECK-NEXT:    [[CNT:%.*]] = and i8 [[CNT_IN:%.*]], 2
; CHECK-NEXT:    [[R:%.*]] = shl nuw i8 [[AMT]], [[CNT]]
; CHECK-NEXT:    ret i8 [[R]]
;
  %amt = and i8 %amt_in, 63
  %cnt = and i8 %cnt_in, 2
  %r = shl i8 %amt, %cnt
  ret i8 %r
}

define i8 @shl_add_nuw_fail(i8 %amt_in, i8 %cnt_in) {
; CHECK-LABEL: @shl_add_nuw_fail(
; CHECK-NEXT:    [[AMT:%.*]] = and i8 [[AMT_IN:%.*]], 63
; CHECK-NEXT:    [[CNT:%.*]] = and i8 [[CNT_IN:%.*]], 3
; CHECK-NEXT:    [[R:%.*]] = shl i8 [[AMT]], [[CNT]]
; CHECK-NEXT:    ret i8 [[R]]
;
  %amt = and i8 %amt_in, 63
  %cnt = and i8 %cnt_in, 3
  %r = shl i8 %amt, %cnt
  ret i8 %r
}

define i8 @shl_add_nuw_and_nsw(i8 %amt_in, i8 %cnt_in) {
; CHECK-LABEL: @shl_add_nuw_and_nsw(
; CHECK-NEXT:    [[AMT:%.*]] = and i8 [[AMT_IN:%.*]], 31
; CHECK-NEXT:    [[CNT:%.*]] = and i8 [[CNT_IN:%.*]], 2
; CHECK-NEXT:    [[R:%.*]] = shl nuw nsw i8 [[AMT]], [[CNT]]
; CHECK-NEXT:    ret i8 [[R]]
;
  %amt = and i8 %amt_in, 31
  %cnt = and i8 %cnt_in, 2
  %r = shl i8 %amt, %cnt
  ret i8 %r
}

define i8 @shl_add_nsw(i8 %amt_in, i8 %cnt_in) {
; CHECK-LABEL: @shl_add_nsw(
; CHECK-NEXT:    [[AMT:%.*]] = or i8 [[AMT_IN:%.*]], -32
; CHECK-NEXT:    [[CNT:%.*]] = and i8 [[CNT_IN:%.*]], 2
; CHECK-NEXT:    [[R:%.*]] = shl nsw i8 [[AMT]], [[CNT]]
; CHECK-NEXT:    ret i8 [[R]]
;
  %amt = or i8 %amt_in, 224
  %cnt = and i8 %cnt_in, 2
  %r = shl i8 %amt, %cnt
  ret i8 %r
}

define i8 @shl_add_nsw_fail(i8 %amt_in, i8 %cnt_in) {
; CHECK-LABEL: @shl_add_nsw_fail(
; CHECK-NEXT:    [[AMT:%.*]] = or i8 [[AMT_IN:%.*]], -64
; CHECK-NEXT:    [[CNT:%.*]] = and i8 [[CNT_IN:%.*]], 2
; CHECK-NEXT:    [[R:%.*]] = shl i8 [[AMT]], [[CNT]]
; CHECK-NEXT:    ret i8 [[R]]
;
  %amt = or i8 %amt_in, 192
  %cnt = and i8 %cnt_in, 2
  %r = shl i8 %amt, %cnt
  ret i8 %r
}

define i8 @lshr_add_exact(i8 %amt_in, i8 %cnt_in) {
; CHECK-LABEL: @lshr_add_exact(
; CHECK-NEXT:    [[AMT:%.*]] = and i8 [[AMT_IN:%.*]], -4
; CHECK-NEXT:    [[CNT:%.*]] = and i8 [[CNT_IN:%.*]], 2
; CHECK-NEXT:    [[R:%.*]] = lshr exact i8 [[AMT]], [[CNT]]
; CHECK-NEXT:    ret i8 [[R]]
;
  %amt = and i8 %amt_in, -4
  %cnt = and i8 %cnt_in, 2
  %r = lshr i8 %amt, %cnt
  ret i8 %r
}

define i8 @lshr_add_exact_fail(i8 %amt_in, i8 %cnt_in) {
; CHECK-LABEL: @lshr_add_exact_fail(
; CHECK-NEXT:    [[AMT:%.*]] = and i8 [[AMT_IN:%.*]], -7
; CHECK-NEXT:    [[CNT:%.*]] = and i8 [[CNT_IN:%.*]], 2
; CHECK-NEXT:    [[R:%.*]] = lshr i8 [[AMT]], [[CNT]]
; CHECK-NEXT:    ret i8 [[R]]
;
  %amt = and i8 %amt_in, -7
  %cnt = and i8 %cnt_in, 2
  %r = lshr i8 %amt, %cnt
  ret i8 %r
}

define i8 @ashr_add_exact(i8 %amt_in, i8 %cnt_in) {
; CHECK-LABEL: @ashr_add_exact(
; CHECK-NEXT:    [[AMT:%.*]] = and i8 [[AMT_IN:%.*]], -14
; CHECK-NEXT:    [[CNT:%.*]] = and i8 [[CNT_IN:%.*]], 1
; CHECK-NEXT:    [[R:%.*]] = ashr exact i8 [[AMT]], [[CNT]]
; CHECK-NEXT:    ret i8 [[R]]
;
  %amt = and i8 %amt_in, -14
  %cnt = and i8 %cnt_in, 1
  %r = ashr i8 %amt, %cnt
  ret i8 %r
}

define i8 @ashr_add_exact_fail(i8 %amt_in, i8 %cnt_in) {
; CHECK-LABEL: @ashr_add_exact_fail(
; CHECK-NEXT:    [[AMT:%.*]] = and i8 [[AMT_IN:%.*]], -14
; CHECK-NEXT:    [[CNT:%.*]] = and i8 [[CNT_IN:%.*]], 2
; CHECK-NEXT:    [[R:%.*]] = ashr i8 [[AMT]], [[CNT]]
; CHECK-NEXT:    ret i8 [[R]]
;
  %amt = and i8 %amt_in, -14
  %cnt = and i8 %cnt_in, 2
  %r = ashr i8 %amt, %cnt
  ret i8 %r
}